[mkgmap-dev] Optimizing MapSplitter

Sat Nov 15 20:01:31 GMT 2014

Hi Andrzej,

thanks for testing. I also think that the possible improvements are rather
small. I'll try a few more changes, e.g. splitting large objects earlier,
but I don't expect any big improvements.
A typical case where it would help is a long diagonal line. The 
bbox for it is very big, and a split in the middle would 
produce two much smaller bboxes. Splitting an rectangle 
like that for the background earlier will probably not help at all.

Gerd

popej wrote
> Hi Gerd,
> 
> patch v3 is working. I have done some speed test on nuvi but conclusions 
> aren't clear. My feeling is that your original settings is a bit slower 
> than standard mkgmap. I have tried some values and settled to:
> 
> LARGE_OBJECT_DIM = 8192;
> int wantedSize = MAX_RGN_SIZE / 4;
> 
> This seems to be a bit faster than standard mkgmap, maybe about 10%, 
> sometimes more. But redraw times aren't always repeatable and my tests 
> are limited to single nuvi model. I would rather say, that there is no 
> significant improvements.
> 
> -- 
> Best regards,
> Andrzej
> _______________________________________________
> mkgmap-dev mailing list

> mkgmap-dev at .org

> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev

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